is a Japanese romantic comedy manga series written and illustrated by Yoshihiro Togashi. It was serialized in the Shueisha magazine Weekly Shōnen Jump from 1989 to 1990.

Plot The storyline of Ten de Shōwaru Cupid follows , a sweet and introverted 15-year-old who lives with his four stepsisters and their father, the leader of the Koinobori yakuza and promiscuous playboy by heritage, just like his own father, grandfather, and so on. Ryuji's family has a tendency to make fun of his innocent nature, causing the boy to continuously try to run away from home. After escaping one day, Ryuji witnesses a beautiful girl with a devil tail bathing in a forest pool. Embarrassed, Ryuji returns to his home only to be confronted by girl the following day. As it turns out, this devil girl named Maria was hired by Ryuji's father to live with them in order to teach his son "the pleasures of the flesh" and make him follow in the family's perverted footsteps.

Characters

The protagonist of this work. He's the heir to the Koinobori-gumi of the Kanto Daigoku yakuza syndicate and a third-year student at Gokuraku Junior High. Although he's in a position to inherit a yakuza family, he has no intention or spirit to do so (according to Tatsuzo later, it's apparently "because his mother left all the childcare to others"). He's pure and longs for fairies and fairytales. He's an irregular existence, arguably the only one born into the Koinobori family without an "evil soul." He's lost interest in real women because he's seen his sisters constantly look down on him and be too insensitive. He has a habit of running away from home frequently, but he always returns quickly. His life is disrupted by Maria, who comes to his home for his rehabilitation, and he gradually becomes attracted to her. He's a member of the art club and has drawn many pictures of his ideal fairy, which he also displays in his room. He's usually an uninspired boy, but once he gets angry (or drinks alcohol or escapes reality), his perverted and violent true nature emerges. In this state, even Maria can't handle him.

The heroine of this work. She moves into the Koinobori household to turn Ryuji, who has absolutely no interest in real women, into a full-fledged pervert. Her true identity is that of a low-ranking demon who trades human souls. She has a tail, wings, and horns, and can use spells. When living in the human world, these are hidden by a secret medicine and spells, but they appear when she's bathing or sleeping. Her personality is more mischievous than innocent. Deceiving others is second nature to her (her main victim is Ryuji). She has no qualms about exposing herself in her underwear or even naked. She boldly showed her naked body upon their first meeting. However, she also has a timid side and is terribly afraid of ghosts. She even faints during a test of courage. She also doesn't seem to be very strong against tickling, as she laughed hysterically when restrained and tickled by Kenta Kanekura (mentioned later). She transfers to the same Gokuraku Junior High as Ryuji, disrupting his school life as well. However, she's an excellent student, ranking first in her grade in the midterm exams. Due to her beauty and talent, she gains considerable popularity within the school. Because of this, she causes and gets involved in trouble. According to Jiva (mentioned later), as a "low-ranking demon, she's close to humans and easily affected by human emotions," and originally "there were times when she strangely lacked malice for a demon," making her a very human-like existence. Her three sizes are B85, W58, H85. Her nipple color is pink (according to her). Her maximum MP is 45. She has a habit of using spells anywhere and often runs out of magic power. Spells she can use are mentioned later. Koinobori-gumi All siblings have different mothers. The sisters have good relationships with each other, while the relationship between the sisters and Ryuji is quite bad (all of them look down on Ryuji to varying degrees).

The head of the Koinobori-gumi and Ryuji's father. 43 years old. He's a giant with messy hair and beard, and a large scar on his cheek (given by a cat). Since he was 15, he was feared by delinquents as "Enma's Tatsuzo," and he had affairs with as many as 100 women. The "evil soul" passed down through generations of the Koinobori family is said to be as valuable as a supreme jewel in the demonic world, and this applies to Tatsuzo as well. He's troubled by Ryuji's ineptitude as an heir, so he hired and housed Maria as a perverted "private tutor". Despite being extraordinarily lecherous, he never lays a hand on Maria. On the other hand, he's overprotective of his daughters, preventing any "bugs" from coming near them. He also has biased views (people who don't speak Japanese are Americans, he dislikes cats because he can't communicate with them, etc.).

The eldest daughter of the Koinobori family. 24 years old. A high school teacher. However, she loves alcohol and cigarettes, and has gone drinking with her students and gotten them all drunk, making her an extremely problematic teacher. Her mother is "the granddaughter of the Kanto Daigoku Rengokai Chairman", and due to her yakuza bloodline, she has an old-fashioned side. Among the sisters, she most overtly looks down on Ryuji.

The second daughter of the Koinobori family. 17 years old. A high school student. Her mother is "a woman born in Osaka". She's Kansai-style and usually wears a sarashi (a traditional Japanese cloth wrapped around the chest). She's very quick to pick fights and is physically strong. When she fights, she seems to lose all control, even attacking the audience and knocking them all down. Because of this, she despises Ryuji as a weakling.

The third daughter of the Koinobori family. 14 years old. Her mother is "an American delinquent girl", making her a half-American. She has a slightly skewed view of Japan. Among the four sisters, she's the most sexually unrestrained, and according to the special chapter "The Wicked Cupid After That", she aims to have a thousand boyfriends in her lifetime and is currently looking for her 101st. Like Tatsuko, she directly disparages Ryuji.

The fourth daughter of the Koinobori family. 10 years old. A fourth-grader. Her mother is a "Kabukicho playgirl". She's the youngest but very responsible, taking care of all the housework for the Koinobori family. She's the most sensible of the four and gets along well with Tatsumi and Maria, but she unconsciously looks down on her brother, Ryuji.

Gokuraku Junior High

Ryuji's bad friend #1. His hair is tied back. His family runs a greengrocer. His name is a pun on "gaitou" (glans) and "tatsu" (to stand, referring to an erection).

Ryuji's bad friend #2. Wears glasses. He once fell in love with Maria's disguised form. His name is a pun on "kakisugi" (over-masturbation) and "seishi" (sperm).

Levi's disguised form in the human world. He has black hair and wears glasses, appearing intellectual. Due to the effect of a certain demon world item, he's favored by the principal and has gained considerable status within the school.

The Madonna of the class next to Ryuji's. She approaches Ryuji, but it's because Maria possessed her, which led to Ryuji being isolated in his class, with even his homeroom teacher not helping him.

Also a member of the art club with Ryuji. He has the talent to find models exactly as Ryuji requests and to finish uniform paintings on the spot. He's interested in the female body. , , Female students chosen by Shiro Makai as Ryuji's partners for the sports festival. However, they were abducted by someone just before the competition, breaking up the pair.

He had the top grades in his year until Maria transferred. Because of this, he held a grudge against Maria and engaged in voyeurism (under the guise of studying and to set her up). He has an anachronistic sense of style, wearing a rising sun headband and ninja attire. He took a picture of Maria's true form while she was bathing but was beaten up by yakuza members and had his photo confiscated. He tried to expose Maria's secret at the morning assembly the next day, but his memory had been lost due to shock.

A student in a different class from Ryuji and Maria. He shares the same birthday as Ryuji. He's the grandson of the Kanekura Group president and the richest student in the school, with a monthly allowance of about 30 million yen. He's handsome and holds many qualifications. On the other hand, he's a dangerous individual who, on each birthday, targets the most beautiful girl of the year and satisfies his desires (he says he's "returning to his childhood"). In the story, for his birthday that year, he targeted the highly-regarded Maria and invited her to a party, using a requested art book for Ryuji as bait. After putting Maria to sleep with a sleeping pill, he tied her to an operating table in the basement in an X-shaped crucifixion. With Maria helpless due to lack of magic power, he unilaterally played a perverted doctor game, gradually cutting her dress with a scalpel, tracing and teasing her soft skin with the scalpel while stripping her naked, leaving her with only one pair of panties remaining. When Maria showed an angry expression at being toyed with, he fearlessly and teasingly tickled her side. This had a tremendous effect, with Maria shaking her head and begging for mercy, exhausting herself. After enjoying the tickling, he finally cut one side of her panties, bringing her one step away from complete nakedness and greatly humiliating her. However, just as he was about to finish, a drunken and transformed Ryuji burst in and knocked him out with one blow.

Initially misunderstood to be in love with Ryuji, she's actually a lesbian underclassman who harbors an admiration, akin to romantic feelings, for Maria. She actively approaches Maria and tries to form a sisterly bond. Even when witnessing Ryuji and Maria's couple-like actions, she interprets them in a way convenient to herself.

Yakuza-related individuals

The heir to the Tohoku Momoshiri-gumi and Ryuji's childhood friend. He was raised to be solely focused on studying, with a dream of becoming a politician. He was an honor student with a bob haircut, thick glasses, and always carrying reference books, but upon their reunion, he had become rebellious, growing into a full-fledged delinquent who loved cigarettes and women (the reason being his yakuza father doing as he pleased while forcing him to study constantly). He's quick to adapt, playing the role of an honor student to deceive those around him, and then attacking them when they let their guard down like a beast. He repeatedly targets Maria, but misunderstands her true identity and Ryuji's feelings, leading to his coming out.

The head of the Momoshiri-gumi and Tatsuzo's old friend. He's a famous womanizer and a pervert who tries to make advances on Tatsuzo's daughters. On the other hand, he's a tiger dad who raised his son, Daisuke, to be a (ostensibly) bookworm. He prefers strong-willed women and, like his son, targets Maria, only to run into Daisuke who had revealed his true nature at the scene. He accepts that "the apple doesn't fall far from the tree" and reconciles.

A yakuza family with a leader dressed like a pirate captain and a prodigal son. They don't get along with the Koinobori-gumi and engage in a karuta game that's like a fight to the death. The son's preferences are abnormal; he liked Ryuji when he was cross-dressing.

Demons

Head of the Planning Department, Japan Branch of the Demon World Soul Bank. He's Maria's boss and a middle-ranking demon. He's quite handsome and loves Maria, but she's completely indifferent to him. He's a narcissist and is always naked under his cape. He's somewhat naive and easily manipulated by Maria. He's obliterated by Jiva but revives as a fly. He's apparently "going to be like this for about 50 years."